North American species of Mycena.

SUBGENUS GLUTINIPES
GREAT emphasis has been placed here on the outer gelatinous
layer of the stipe. This layer not only affords a very convenient character by which to recognize the group, but brings together three distinct phylogenetic lines which are clearly derived from
various groups within the sections Typicae and Omphaliariae. The
most discordant elements are M. insignia and M. rorida. The relationships of these species are obscure, and so a practical grouping is
preferred here to any questionable natural arrangement. Hence
they are placed together in the section Diversiformes. The species in
the sections Viscosae and Caespitosae form two homogeneous natural
series. It is interesting to note that the latter section is made up
entirely of American species. M. trojana and M. fumosiavellanea,
which have been described by Murrill from the American tropics
and which have been found to belong in this subgenus, are grouped
in the special section (pp. 453-470), along with his other tropical
species.
KEY TO SECTIONS
1. Pileus dry or very soon becoming so; no gelatinous layers in or on
pileus................................. Section Diversiformes 4
1. Pileus viscid, often hoary at first; gelatinous layers present on cap as
pellicle or just under thin nongelatinous pellicle................ 2
2. Conspicuously cespitose species with lignicolous habitats, rarely
gregarious (certain varieties in Viscosae grow gregariously or scattered on mossy logs)................... Section Caespitosae 6
2. Humus-dwelling forms, usually gregarious or scattered........... 3
3. Stipe with yellow or greenish to greenish-gray tints.. Section Viscosae 13
3. Stipe pallid or grayish to fuscous............. Section Fuliginellae 18
KEY TO SPECIES
DIVERSIFORMES
4. Pileus with palisade layer of pear-shaped cells forming surface layer
203. M. rorida
4. Pileus not as above........................................... 5
401